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Wind tunnel test of snow redistribution on flat roofs

机译：平屋顶积雪再分配的风洞试验

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摘要

In regions prone to heavy snowfall, an accurate estimation of snow redistribution on roofs under the action of wind is vital for structural engineers. The content of unbalanced snow loads of flat roofs caused by snow transport is indispensable in current load codes/standards. Hence, the wind tunnel tests were performed to investigate the redistribution of snow on flat roofs, in which high-density silica sand was used. The characteristics of snow redistribution on flat roofs are discussed, and common features are pointed out. The largest snow depth usually occurs near the windward region, and for a large-span flat roof the peak point could also occur in the rear region of the roof. In addition the locations of peak points after snow redistribution and the influence of wind velocity, wind duration and roof span on transport rates and mass fluxes are analyzed in detail. The transport rate increases as wind velocity or roof span increases but it is not a simple proportional relationship with roof span. Moreover, the transport efficiency of particles declines as wind duration becomes longer. Mass flux of the entire roof, which is the transport rate per unit length, asymptotically decreases with the increasing of roof span. (C) 2016 Elsevier B.V. All rights reserved.
机译：在容易下大雪的地区，准确估计屋顶在风的作用下雪的重新分布对结构工程师至关重要。在现行的负荷规范/标准中，由雪运输引起的平屋顶雪负荷不平衡的内容是必不可少的。因此，进行了风洞试验，以研究使用高密度硅砂的平屋顶上雪的重新分布。讨论了平屋顶上积雪的分布特征，并指出了共同特征。最大的积雪深度通常发生在迎风区域附近，对于大跨度的平坦屋顶，峰值点也可能出现在屋顶的后部区域。此外，还详细分析了积雪重新分布后的峰值点位置，以及风速，风持续时间和屋顶跨度对运输速率和质量通量的影响。传输速率随风速或屋顶跨度的增加而增加，但这并不是与屋顶跨度的简单比例关系。而且，随着风的持续时间变长，颗粒的输送效率下降。整个屋顶的质量通量，即每单位长度的运输速度，随着屋顶跨度的增加而渐近减小。 （C）2016 Elsevier B.V.保留所有权利。

著录项

  • 来源
    《Cold regions science and technology》 |2016年第7期|49-56|共8页
  • 作者

    Zhou Xuanyi; Kang Luyang; Yuan Xiaomeng; Gu Ming;

  • 作者单位

    Tongji Univ, State Key Lab Disaster Reduct Civil Engn, Shanghai 200092, Peoples R China;

    Tongji Univ, State Key Lab Disaster Reduct Civil Engn, Shanghai 200092, Peoples R China;

    Tongji Univ, State Key Lab Disaster Reduct Civil Engn, Shanghai 200092, Peoples R China|Shanghai Tobacco Grp Co Ltd, Shanghai 200092, Peoples R China;

    Tongji Univ, State Key Lab Disaster Reduct Civil Engn, Shanghai 200092, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Flat roof; Snow redistribution; Wind tunnel test; Transport rate;

    机译：平屋顶;雪重分配;风洞试验;运输速度;

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